vdw_param = {  # alpha, C6, R0
    'H': [4.5000, 6.5000, 3.1000],
    'He': [1.3800, 1.4600, 2.6500],
    'Li': [164.2000, 1387.0000, 4.1600],
    'Be': [38.0000, 214.0000, 4.1700],
    'B': [21.0000, 99.5000, 3.8900],
    'C': [12.0000, 46.6000, 3.5900],
    'N': [7.4000, 24.2000, 3.3400],
    'O': [5.4000, 15.6000, 3.1900],
    'F': [3.8000, 9.5200, 3.0400],
    'Ne': [2.6700, 6.3800, 2.9100],
    'Na': [162.7000, 1556.0000, 3.7300],
    'Mg': [71.0000, 627.0000, 4.2700],
    'Al': [60.0000, 528.0000, 4.3300],
    'Si': [37.0000, 305.0000, 4.2000],
    'P': [25.0000, 185.0000, 4.0100],
    'S': [19.6000, 134.0000, 3.8600],
    'Cl': [15.0000, 94.6000, 3.7100],
    'Ar': [11.1000, 64.3000, 3.5500],
    'K': [292.9000, 3897.0000, 3.7100],
    'Ca': [160.0000, 2221.0000, 4.6500],
    'Sc': [120.0000, 1383.0000, 4.5900],
    'Ti': [98.0000, 1044.0000, 4.5100],
    'V': [84.0000, 832.0000, 4.4400],
    'Cr': [78.0000, 602.0000, 3.9900],
    'Mn': [63.0000, 552.0000, 3.9700],
    'Fe': [56.0000, 482.0000, 4.2300],
    'Co': [50.0000, 408.0000, 4.1800],
    'Ni': [48.0000, 373.0000, 3.8200],
    'Cu': [42.0000, 253.0000, 3.7600],
    'Zn': [40.0000, 284.0000, 4.0200],
    'Ga': [60.0000, 498.0000, 4.1900],
    'Ge': [41.0000, 354.0000, 4.2000],
    'As': [29.0000, 246.0000, 4.1100],
    'Se': [25.0000, 210.0000, 4.0400],
    'Br': [20.0000, 162.0000, 3.9300],
    'Kr': [16.8000, 129.6000, 3.8200],
    'Rb': [319.2000, 4691.0000, 3.7200],
    'Sr': [199.0000, 3170.0000, 4.5400],
    'Y': [126.7370, 1968.580, 4.8151],
    'Zr': [119.97, 1677.91, 4.53],
    'Nb': [101.603, 1263.61, 4.2365],
    'Mo': [88.4225, 1028.73, 4.099],
    'Tc': [80.083, 1390.87, 4.076],
    'Ru': [65.8950, 609.754, 3.9953],
    'Rh': [56.1, 469.0, 3.95],
    'Pd': [23.6800, 157.5000, 3.6600],
    'Ag': [50.6000, 339.0000, 3.8200],
    'Cd': [39.7, 452.0, 3.99],
    'In': [70.2200, 707.0460, 4.2319],
    'Sn': [55.9500, 587.4170, 4.3030],
    'Sb': [43.6719, 459.322, 4.2760],
    'Te': [37.65, 396.0, 4.22],
    'I': [35.0000, 385.0000, 4.1700],
    'Xe': [27.3000, 285.9000, 4.0800],
    'Cs': [427.12, 6582.08, 3.78],
    'Ba': [275.0, 5727.0, 4.77],
    'La': [213.70, 3884.5, 3.14],
    'Ce': [204.7, 3708.33, 3.26],
    'Pr': [215.8, 3911.84, 3.28],
    'Nd': [208.4, 3908.75, 3.3],
    'Pm': [200.2, 3847.68, 3.27],
    'Sm': [192.1, 3708.69, 3.32],
    'Eu': [184.2, 3511.71, 3.40],
    'Gd': [158.3, 2781.53, 3.62],
    'Tb': [169.5, 3124.41, 3.42],
    'Dy': [164.64, 2984.29, 3.26],
    'Ho': [156.3, 2839.95, 3.24],
    'Er': [150.2, 2724.12, 3.30],
    'Tm': [144.3, 2576.78, 3.26],
    'Yb': [138.9, 2387.53, 3.22],
    'Lu': [137.2, 2371.80, 3.20],
    'Hf': [99.52, 1274.8, 4.21],
    'Ta': [82.53, 1019.92, 4.15],
    'W': [71.041, 847.93, 4.08],
    'Re': [63.04, 710.2, 4.02],
    'Os': [55.055, 596.67, 3.84],
    'Ir': [42.51, 359.1, 4.00],
    'Pt': [39.68, 347.1, 3.92],
    'Au': [36.5, 298.0, 3.86],
    'Hg': [33.9, 392.0, 3.98],
    'Tl': [69.92, 717.44, 3.91],
    'Pb': [61.8, 697.0, 4.31],
    'Bi': [49.02, 571.0, 4.32],
    'Po': [45.013, 530.92, 4.097],
    'At': [38.93, 457.53, 4.07],
    'Rn': [33.54, 390.63, 4.23],
    'Fr': [317.8, 4224.44, 3.90],
    'Ra': [246.2, 4851.32, 4.98],
    'Ac': [203.3, 3604.41, 2.75],
    'Th': [217.0, 4047.54, 2.85],
    'Pa': [154.4, 2367.42, 2.71],
    'U': [127.8, 1877.10, 3.00],
    'Np': [150.5, 2507.88, 3.28],
    'Pu': [132.2, 2117.27, 3.45],
    'Am': [131.20, 2110.98, 3.51],
    'Cm': [143.6, 2403.22, 3.47],
    'Bk': [125.3, 1985.82, 3.56],
    'Cf': [121.5, 1891.92, 3.55],
    'Es': [117.5, 1851.1, 3.76],
    'Fm': [113.4, 1787.07, 3.89],
    'Md': [109.4, 1701.0, 3.93],
    'No': [105.4, 1578.18, 3.78],
}
